VAT 642 AP Series, Installation, Operating, & Maintenance Instructions

Page: 59 / 113

Series 642 INSTALLATION
605593EC Edition 2017-11-24 59/113
4.8.2 Assembly object bit map
This is an example based on output assembly 8 and input assembly 3 to illustrate bit map.
DATA TYPE in this example is signed integer.
4.8.2.1
Output assembly
Assembly Type Byte Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
8 Output
1 MODE
2 SETPOINT low byte
3 SETPOINT high byte
4 SETPOINT TYPE
CONTROL MODE may be set to one out of below selections, see also «Explicit messaging control
commands»:
Description Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Control valve 0 0 0 0 0 0 0 0
Close valve 0 0 0 0 0 0 0 1
Open valve 0 0 0 0 0 0 1 0
Hold valve 0 0 0 0 0 0 1 1
SETPOINT may be set to any value between the lowest and the highest value. Depending on SETPOINT
TYPE it reflects position or pressure setpoint , see also «Explicit messaging control commands».
Description Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Lowest value (0)
low byte 0 0 0 0 0 0 0 0
high byte 0 0 0 0 0 0 0 0
Highest value (10000)
low byte 0 0 0 1 0 0 0 0
high byte 0 0 1 0 0 1 1 1
SETPOINT TYPE may be set to one out of below selections, see also «Explicit messaging control
commands».
Description Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Pressure control 0 0 0 0 0 0 0 0
Position control 0 0 0 0 0 0 0 1